It seems that I can't drag the weapons and items to add them when configuring my NPCs's fitouts, it just doesn't register anything, yet I can delete assigned weapons and armor from old fitouts. I've tried it out in firefox and chrome.

Has anyone else encountered this, is this a bug or something wrong with my browser?

CORRECTION: The old system, through the inventory's "Manage fitouts" works this way for me, not the one from the "NPC control"